Jefferson Davis’s sons died young and w/o issue, but because of his stature his daughter convinced her husband to let their children use the surname Davis (or in some cases Hayes-Davis) in order to perpetuate the line. Grant’s many descendants include the actor Grant Goodeve (Eight is Enough) and an aristocratic Italian family. None of Lee’s daughters married, according to legend because they never thought they’d find a man as good as their father, but the sons made up for them in the procreation department; Lee & his children are interred in a basement mausoleum of the chapel at Washington & Lee university directly beneath this statue of the recumbent Lee that many understandably mistake for a sarcophagus.
I thought a statue on top of a tomb was a sarcophagus? 
Jessie was actually a daughter. Wilson had no sons.
A sarcophagus is a sculpted coffin.
In case anybody’s curious, Truman is the earliest president with a child who is still alive (with the possible exception of Harding; nothing is known of Nan Britton’s daughter Elizabeth Ann, who would be 85 but is possible still living [her mother lived until 1991, which must be some sort of record for oldest surviving presidential mistress] though it is not conclusively proven she was Harding’s daughter [though he definitely paid child support for her]).
I’m reading a book on Presidential children now, and as of the publishing date (last year), Harding’s daughter is still alive and lives in Oregon. She shuns publicity and is quoted as saying “We’ve lead very normal, boring lives.”
Daughter of Theodore’s brother. Since he died while she was quite young, the answer to my trivia question earlier in the thread is Franklin and Eleanor. While Franklin was TR’s fifth cousin, Eleanor (whose maiden name was Roosevelt) was his niece, and with his brother being dead, he hosted the wedding at the White House and gave her away.
Lee Harvey Oswald’s daughters are still around, I think.